return err on interruption

ethdb/olddb/mapmutation.go

@@ -8,6 +8,7 @@ import (
 	"time"
 	"unsafe"
 
+	"github.com/ledgerwatch/erigon-lib/common"
 	"github.com/ledgerwatch/erigon-lib/etl"
 	"github.com/ledgerwatch/erigon-lib/kv"
 	"github.com/ledgerwatch/erigon/ethdb"
@@ -246,7 +247,7 @@ func (m *mapmutation) doCommit(tx kv.RwTx) error {
 				log.Info("Write to db", "progress", progress, "current table", table)
 				tx.CollectMetrics()
 			case <-m.quit:
-				return nil
+				return common.ErrStopped
 			}
 		}
 		if err := collector.Load(m.db, table, etl.IdentityLoadFunc, etl.TransformArgs{Quit: m.quit}); err != nil {